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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Funds - Summary of Breakdown of Funds Obtained in Institutional Markets (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds R$ 104,244 R$ 93,974
Subordinated debt [Member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds R$ 59,462 49,313
Interest rate for each operations 4.63%  
Obligations on securities abroad [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds R$ 43,672 41,863
Obligations on securities abroad [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interest rate for each operations 2.05%  
Obligations on securities abroad [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interest rate for each operations 30.13%  
Raisings through structured operations certificates [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds R$ 1,110 2,798
Raisings through structured operations certificates [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interest rate for each operations 2.62%  
Raisings through structured operations certificates [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Interest rate for each operations 11.12%  
Current [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds R$ 13,835 8,524
Current [member] | Subordinated debt [Member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds 4,098 343
Current [member] | Obligations on securities abroad [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds 9,162 6,232
Current [member] | Raisings through structured operations certificates [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds 575 1,949
Non-current [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds 90,409 85,450
Non-current [member] | Subordinated debt [Member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds 55,364 48,970
Non-current [member] | Obligations on securities abroad [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds 34,510 35,631
Non-current [member] | Raisings through structured operations certificates [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Institucional market funds R$ 535 R$ 849